John vandeeoae



@eine tateaatrnt @frn JOHN YANDEROAR, OF BROOKLYN, NEW YORK, ASSIGNOR 4TO L. B. TOPPER,

' OF NEW YORK CITY.

IMPROVBD FIRE-GRATIS @la entaille rentar tul in' there tritets @dat :mir 'taking gaat nf its sana.v

TO ALL WHOM IT MAY OONOERN: f

Be it known that I, JOHN VANDERGAR, of l3rooklyn,inl the county of Kings, and State of New York, have invented a new and useful Improvement in Furnace-Grate Bars; and I do hereby declare that the following is` a full, clear, and exact description ofthe saine, referencebeing had to the accompanying drawing which forms part of this specification. i

Figure A1 is a perspective View of my invention.

Figure 2 is a transverse vertical section thereof.

My invention consists in constructinga long bar or section of a grate with one central longitudinal bar, and a series of transverse bars on each -side thereof, running from the frame or longitudinal side bars to the central bar in unbroken diagonal lines, those on the one side meeting the said central bar at alternate points to those on the other side, whereby I gain great strength, and produce a. bar which will have a perfectly free chance for expansion and contraction, both transversely and longitudinally, Without liability of breaking or warping. Y f i The drawing represents the invention applied to aflong bar, so called, B B O O designating the frame,

B being the side strips and O the end-pieces.v j 4 A designates a central bar, running longitudinally from one end-piece to the other. This bar A is arched downward at its under edge, so as to be deeper at its centre than at its ends, as shown at n n', tig. 1, bv which construction I obtain great strength at the centre, where it is more especially required.

The transverse bars, d, are arranged so as to run in diagonal directions from the sidestrips B to the central bar A,A and the series on one side is arranged in such relation to that on the other side of the said central bar A- that the `points of their junction with thesaid barA arealtern'ate to those of the series on the other side, or, in other Words, they break joints with each other on opposite sides of the bar A, whcrebyincreased strength is obtained. These cross-bars are deeper vertically where theyjoin the'longitudinal bar A than where theyjoin the frame B, lasshown in fig. 2, thus insuring greater strength at such points.

It will thus be seen that the whole bar is so constructed that greater strength'is insured at its centre than elsewhere, and this is theplace where such strength is necessary.

By arranging the cross-bars diagonally across the spaces between the central bar A and the sides of the frame, the bar is given a greater capacity for expansion land contraction in either a longitudinal or lateral direction, or both. To explain: It' the expansion be entirely in a longitudinal direction, as to either the sides or the central bar, then thc cross-bars being placed diagonally, such expansion can take place without straining the said cross-bars,.their angle with the bar being greater or less, according to the degree of expansion. On the other hand, if the expansion be laterally, the cross-bars will allowvfor thisvlateral expansion, and in proportion to the degree of such expansion will assume a greater angle with the central bar and sides of the frame. Now, were the cross-bars arranged at right angles to the frame, there would not be this giving or conforming of the crossbars to the expansion and contraction 4of the grate-bars; for instance, it' the sides of the bar expand laterally and the bar not in proportion, then there is necessarily a breakage of the longitudinal bars at some intermediate space between the cross-bars'. i .f

It will therefore be' seen that by this invention, I provide a strong and durable grate-bar, and one which has a great capacity for expanding or contracting, without liability of warpingor receiving other injury.

I will here remark that I do not claim so arranging the cross-bars oi' a grate that thos'e on one side of a longitudinal bar will break joints with those on the other side of the same bar, for I ani aware that this is shown in a. patent grantcdme on the 24th day of May, 1864.

What I claim as my invention, and desire to secure by Letters Patent, is- A furnace-grate bur, provided with a'central longitudinal bar, A, and two series of cross-bars, cl, the latter running diagonally from the frame B to the said central bar A, and the bars of cach series adjoining the said central bar at alternate points, thereby breaking joints with each other, substantially as herein shown and described.

JOHN VANDEROAR.

VWitnesses:

, C. E. Loran, Y JAMES P. McLean. 

